Default kubernetes_manifest experiment to true

[jrhouston]

Description

This PR enables kubernetes_manifest by default.

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

Default manifest_resource experiment to true

References

Community Note

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[github-actions]

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